MATLAB Fundamentals course problem

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Nicholas Caputo
Nicholas Caputo 2017-11-11
评论： Chaitanya Chitale 2017-11-16
Hi, I have a problem in this course in this part: "5.11 Reshaping Arrays: (7/8) Overall Average Electricity Revenue" for task 1. I receive an error message even if my answer is correct. It doesn't find the variable named avgRev. Can anyone help me? Thanks, Nicholas

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Chaitanya Chitale
Chaitanya Chitale 2017-11-13
编辑：Chaitanya Chitale 2017-11-13
This is a bug in certain practice problems in the MATLAB Fundamentals and the Machine Learning with MATLAB courses caused by the use of the function boolean in the grading code. This function is only available in Simulink which is not available in the online course environment.
We are working on fixing the bug as soon as possible.
As a workaround, please add the following line of code at the top of the MATLAB script before submitting:
boolean = @logical;

更多回答（3 个）

Jan
Jan 2017-11-11
Can anyone help me?
Yes. Or no. It depends on what kind of help you want.
The error message is clear already: It is tried to use the variable "avgRev", but it has not been created before. The message contains the line, where the code fails. Open it in the editor and find out, where you have to provide this variable or where to create it. Perhaps it is a typo only.
For a more specific help, we need the (relevant part of the) code, the complete error message and the code you use for calling this function (or do you use the "Run" icon in the editor?).
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gs
gs 2017-11-12
编辑：gs 2017-11-12
Task 2 can't be enabled without passing Task 1. I think the bug is the use of "boolean" instead of "isboolean" in the assert command in the test suite. I attach a screenshot of the test suite details.
Jan
Jan 2017-11-13
isboolean is not useful here, because exist replies a double with an integer number. Try to define boolean as in a dummy in the code:
boolean = @(x) x

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gs
gs 2017-11-12
编辑：gs 2017-11-13
I've encountered a similar bug in part: "6.1 Project - Halfway Review of Fundamentals: (2/3) Women's 200m Backstroke". I attach the code of the test suite details:
t1__ = (boolean(exist('name')))
t2__ = (boolean(exist('country')))
t3__ = (boolean(exist('time')))
assert(t1__ && t2__ && t3__)
Walter Roberson
Walter Roberson 2017-11-13
编辑：Walter Roberson 2017-11-13
In another related Question, Mathworks said it is a bug that they will repair ASAP.
Unfortunately I cannot find that question now to make sure they know to look at all the various chapters.

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